<template>
  <!-- 商品参数组件 -->
  <div>
    <!-- 面包屑区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
     <el-breadcrumb-item :to="{ path: '/homePage' }">首页</el-breadcrumb-item>
     <el-breadcrumb-item>商品管理</el-breadcrumb-item>
     <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 头部警告框区域 -->
      <el-alert title="注意：只允许为第三级参数设置参数" type="warning" show-icon :closable="false" effect="dark"></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row>
        <el-col>
          <span>选择商品分类:
            <!-- 选择商品分类的级联选择框 -->
            <el-cascader v-model="selectedCateKeys" :options="catelist" :props="{ expandTrigger: 'hover', value: 'cat_id', label: 'cat_name', children: 'children' }" @change="handleChange" clearable></el-cascader>
          </span>
        </el-col>
      </el-row>

      <!-- tab页签区 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" :disabled="isBtnDisabled" @click="(addDialogVisible = true)">添加参数</el-button>
          <!-- 动态参数数据表格 -->
          <el-table :data="manyTableData" border stripe v-if="activeName === 'many'">
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index, scope.row)">{{item}}</el-tag>
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" size="mini" @click="showEditDialog(scope.row.attr_id)" icon="el-icon-edit">编辑</el-button>
                <el-button type="danger" size="mini" @click="removeParams(scope.row.attr_id)" icon="el-icon-delete">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" :disabled="isBtnDisabled" @click="(addDialogVisible = true)">添加属性</el-button>
          <!-- 静态参数数据表格 -->
          <el-table :data="onlyTableData" border stripe v-if="activeName === 'only'">
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index, scope.row)">{{item}}</el-tag>
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" size="mini" @click="showEditDialog(scope.row.attr_id)" icon="el-icon-edit">编辑</el-button>
                <el-button type="danger" size="mini" @click="removeParams(scope.row.attr_id)" icon="el-icon-delete">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>

    </el-card>

    <!-- 添加参数的弹窗 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的弹窗 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>

  </div>
</template>

<script>
export default {
  data () {
    return {
      // 获取到的商品分类
      catelist: [],
      // 级联选择框选中数据时双向绑定到的数组，选中了哪个就吧id打印
      selectedCateKeys: [],
      // 被激活的页签名称
      activeName: 'many',
      // 动态参数页签的数据
      manyTableData: [],
      // 静态参数页签的数据
      onlyTableData: [],
      // 添加弹窗的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {},
      // 添加参数的表单验证规则对象
      addFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      // 控制修改弹窗的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [{ required: true, message: '请输入要修改的参数名称', trigger: 'blur' }]
      }
    }
  },

  created () {
    this.getCateList()
  },

  methods: {
    // 获取所有的商品分类
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.catelist = res.data
      // console.log(this.catelist)
    },
    // 级联选择框选中项变化hi触发这个事件
    handleChange () {
      this.getParamsData()
    },
    // tab页签点击事件
    handleTabClick () {
      // console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData () {
      // console.log(this.selectedCateKeys)
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 选择了三级分类，根据所选id，和当前所属面板，获取对应数据
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      // console.log(res.data)
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中驶入的值
        item.inputValue = ''
      })
      // console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加弹窗的关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, { attr_name: this.addForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 201) {
          return this.$message.error('获取参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮展示修改弹窗
    async showEditDialog (attrid) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrid}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 修改弹窗关闭时重置表单
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮修改参数信息
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }
        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据id删除参数属性
    async removeParams (attrid) {
      const confirmResult = await
      this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消删除！')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrid}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }
      this.$message.success('删除参数成功！')
      this.getParamsData()
      this.editDialogVisible = false
    },
    // 文本框失去焦点，或摁下enter键触发事件
    async handleInputConfirm (row) {
      // console.log('ok') 没有输入内容
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 输入了内容
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    // 将对attr_vals的操作保存到数据库
    async saveAttrVals (row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, { attr_name: row.attr_name, attr_sel: row.attr_sel, attr_vals: row.attr_vals.join(' ') })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败！')
      }
      this.$message.success('修改参数项成功！')
    },
    // 点击按钮切换文本输入框
    showInput (row) {
      row.inputVisible = true
      // 文本框自动获得焦点 $nectTick当页面的元素被重新渲染后才会执行回调
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应参数的tag
    handleClose (index, row) {
      row.attr_vals.splice(index, 1)
      this.saveAttrVals(row)
    }
  },

  computed: {
    // 如果按钮需要被禁用，则返回true,没有选择级联选择框就不给用按钮
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选择的三级分类的id
    cateId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算弹窗标题的文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style scoped>
.el-row {
  margin: 15px 0;
}
.el-tag {
  margin: 5px;
}
.input-new-tag {
  width: 100px;
}
</style>
